Dr. Chao Tong and Dr. Hongbo Qi

Department of Obstetrics, The First Affiliated Hospital of Chongqing Medical University, 1 Youyi Road, Yuzhong District, Chongqing 400016 (China)
Tel: +86 23 89011101; +86 23 89011865, E-Mail chaotongcqmu@163.com; qihongbo728@163.com